Sintered ndfeb magnet Ndfeb, the third generation of rare-earth permanent magnet, is the most powerful and advanced commercialized permanent magnet today. Ndfeb has the high remanence, high coercive force, high-energy product and high performance/cost ratio, it can be formed into various sizes and widely used in many fields such as aviation, electronics, instruments, meters, machine, medical instrument and the like. It is especially suitable for the development of high-performance, compact and light products. A variety of coatings can be applied to the ndfeb magnets' surface to overcome the principle drawback of neodymium-based magnets, their tendency to corrode easily.